/**
 * #      1026
 * 名称   节点与其祖先之间的最大差值
 * 链接   https://leetcode-cn.com/problems/maximum-difference-between-node-and-ancestor
 * 题解   [139](https://leetcode-cn.com/problems/maximum-difference-between-node-and-ancestor/solution)
 * 通过率 65.6%
 * 难道   中等
 */

